So this tune I went about backwards for fun I wanted 880 fps and 1/4 from max hammer spring. With fx 25.4 gn pellets. Got velocity set last night ended with 1750 psi at 885. Tonight shot of accuracy at 25 yards one cloverleaf hole. Then moved to 50 yards the target is 3 groups of 3 as I zeroed the scope. I have opened up barrel port as well as transfer port